“…Given that the Jaguaribe region has, according to IBGE (2015b) data on municipal livestock production, numbers of approximately 7,600,000 cattle, 4,300,000 pigs, 4,000,000 goats, 8,000,000 sheep and 100,000,000 chickens. And, since it is known that waste from these animals is raw material for the generation of biogas, this renewable energy source is very interesting for this region, as well as for others of the state of Ceará, as already evidenced by Feitosa et al (2014a) and Prado (2016).…”